Temperature Sender - Toro Z Master Z597 Service Manual

TEMPERATURE SENDER

Purpose
The temperature sender is a temperature-dependent
variable resistor. As the coolant temperature increases
the internal resistance decreases. This causes a change
in voltage applied to the water temperature gauge, which
indicates a higher temperature.
Location
The temperature sender is located on the right side of
the engine water pump (Fig. 369).
Fig 369
Z Master 597 Diesel Series Service Manual
How It Works
When the water temperature increases the internal
resistance decreases which will cause the water
temperature gauge to increase (Fig. 370).
Testing
It is not practical to test the sender in a shop environ-
ment. If the gauge is not reading at all, temporarily
ground the lead at the sender. If the meter reads full
scale, the ground wire and gauge are OK and the sender
is bad. If the gauge does not respond, check for 12 VDC
at gauge and continuity of the ground lead. If OK, the
DSC-2547
gauge is bad. Erratic readings can be either the gauge
or sender. Replace the sender first, when diagnosing.
ELECTRICAL
Fig 370 DSC-2548
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